Even though Caribou was certified to not be supporting overseas groups involved in terrorism, I did not want to support Arcapita's middle-eastern Muslim investors, so I refused to patronize them.
However, I am changing my position. According to this article, Arcapita has sold a large portion of its shares in Caribou, and now only owns about 25% of the company. Arcapita may be the largest single shareholder, however, the public now owns most of the company.
By the way, you still can't get pork at Caribou, in case you were wondering.